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Diastereoselective Template Synthesis on Iron and Uranium
Organometallics ( IF 2.5 ) Pub Date : 2021-07-09 , DOI: 10.1021/acs.organomet.1c00296
Stephanie H. Carpenter 1 , Brennan S. Billow 1 , Aaron M. Tondreau 1
Affiliation  

The addition of 2 equiv of tBu2PSiMe3 to 2,6-pyridinedicarboxaldehyde ((CHO)2Py) results in a rac/meso diastereomeric mixture of the PNP-chelating ligand 2,6-bis((trimethylsiloxy)(di-tert-butylphosphino)-methyl)-pyridine ((OTMS)PNPtBu) (1-r/m) via addition of the P–Si bond across both of the aldehyde C–O bonds. Chelation of (OTMS)PNPtBu to FeCl2 results in the same diastereotopic ratio of ((OTMS)PNPtBu)FeCl2 (2-r/m) as the free ligand. Fractional crystallization allows for the isolation of the C2 isomer, 2-r, and a template synthesis protocol allows for the synthesis and isolation of the Cs isomer, 2-m, in good yield. The template synthesis protocol was also expanded to the f-block with the use of UCl4 in order to assess the specificity of the template synthesis on a larger metal cation. This reaction performed on UCl4 forms the meso diastereospecific uranium complex ((tBu2P)ONO)UCl2(dtbpy), 3-m, with observation of the rational intermediate ((OTMS)PNOtBu)UCl3(dtbpy), 4-m, which arose from the respective formation of two- or one-equivalents of TMS–Cl and formation of the corresponding U–O bond.

中文翻译:

铁和铀的非对映选择性模板合成

加入2当量的2 PSiMe 3至2,6- pyridinedicarboxaldehyde((CHO)2 PY)导致外消旋/内消旋的非对映体混合物中的PNP螯合配位体2,6-双((三甲基甲硅烷)(二丁基膦基)-甲基)-吡啶 ( (OTMS) PNP t Bu ) ( 1 - r / m ) 通过在两个醛 C-O 键上添加 P-Si 键。的螯合作用(OTMS) PNP到的FeCl 2次的结果中(同一非对映异构比例(OTMS) PNPt Bu )FeCl 2 ( 2- r / m ) 作为游离配体。分级结晶允许分离C 2异构体2- r,模板合成方案允许合成和分离C s异构体2- m,收率良好。模板合成协议还扩展到f- block 使用 UCl 4以评估模板合成对较大金属阳离子的特异性。该反应在 UCl 4 上进行形成了内消旋非对映特异性铀复合物 ( ( t Bu2P) ONO) UCl 2 (dtbpy), 3 - m,观察合理中间体 ( (OTMS) PNO t Bu ) UCl 3 (dtbpy), 4 - m,它们来自各自的地层两个或一个当量的 TMS-Cl 并形成相应的 U-O 键。
更新日期:2021-08-09
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